Device and method for measuring radial stress of transformer winding

Abstract

The invention discloses a device and a method for measuring radial stress of a transformer winding. The device comprises a first optical fiber splice, a first glass fiber tape, a first fiber bragg grating strain sensor, a first optical fiber coupler, a first internal connection optical fiber, a first external connection optical fiber, a fiber bragg grating interrogator and a computer, wherein the first glass fiber tape is glued on transformer coil winding surface insulation paper; the first fiber bragg grating strain sensor is fixed on the first glass fiber tape; an input end of the first optical fiber coupler is connected with an output end of the first fiber bragg grating strain sensor; one end of the first internal connection optical fiber is connected with an output end of the first optical fiber coupler; the first external connection optical fiber is connected with the other end of the first internal connecting optical fiber; the fiber bragg grating interrogator is connected with the first external connection optical fiber; the computer is connected with the fiber bragg grating interrogator; and the first internal connection optical fiber is connected with the first external connection optical fiber through the first optical fiber splice. According to the device and the method, accurate and effective winding radial stress measuring data are provided for research of anti-short-circuit capacity of a transformer and diagnosis of deformation of the transformer winding.

Description

technical field [0001] The invention relates to the technical field of transformer state monitoring, in particular to a transformer winding amplitude stress measuring device and a measuring method. Background technique [0002] Large-scale power transformers are one of the important equipment in the power system. If an accident occurs during operation, it may cause a large-scale power outage in the region, which will bring huge economic losses to the society and bring adverse social impacts to the power sector. [0003] After the transformer windings carry current, an axial and radial leakage magnetic field will be established in the space where they are located and the surrounding space; the winding itself in this magnetic field will be subjected to a force, which is called "Lorentz force" or Call it the electromagnetic force. Electromagnetic forces generate mechanical stresses in the transformer winding material and are partly transmitted to other components of the transf...

AI Technical Summary

Problems solved by technology

[0005] At present, domestic studies on the axial and amplitude stresses of the windings when the transformer is subjected to short-circuit current shocks all use theoretical calculation methods. However, due to the complex internal mechanical structure of the transformer, there is still a gap between the calculation of relevant parameters such as current density and leakage magnetic field and the actual situation. Moreover, the short-circuit impact of the transformer winding has a superimposed effect, and the relevant calculations are difficult to truly grasp the stress condition of the transformer winding, and cannot provide support for the research and judgment of the short-circuit deformation of the transformer.

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